Subject-Verb Agreement Checker- Fix Errors

Subject-verb agreement is one of the most common grammar mistakes in English, even among fluent speakers and native writers. It happens when the verb in a sentence doesn’t match its subject in number — writing “he go” instead of “he goes,” or “the students is ready” instead of “the students are ready.” These small slips can make otherwise strong writing look careless, whether it’s a resume, an email, an essay, or a blog post.

This guide breaks down the core rules, common mistakes, and a quick-reference table — plus a free tool below that checks your sentences instantly.

What Is Subject-Verb Agreement?

Subject-verb agreement means the verb in a sentence must match its subject in number: singular subjects take singular verbs, and plural subjects take plural verbs. It sounds simple, but English has enough exceptions and irregular verbs that mistakes creep in easily — especially in longer sentences where the subject and verb are separated by other words.

Core Rules of Subject-Verb Agreement

• Singular subjects need singular verbs: “She writes” not “She write.”
• Plural subjects need plural verbs: “They write” not “They writes.”
• “I” and “you” take the base or plural verb form: “I go,” “You are,” never “I goes.”
• Ignore words between subject and verb: “The list of items is long” — the verb agrees with “list,” not “items.”
• Compound subjects joined by “and” are usually plural: “Tom and Jerry are friends.”
• Subjects joined by “or”/”nor” agree with the nearer subject: “Neither the teacher nor the students were ready.”
• Collective nouns (team, family, group) are usually singular: “The team is winning,” unless referring to individual members acting separately.
• Indefinite pronouns like “everyone,” “each,” “someone” are singular: “Everyone has arrived.”

Quick Reference Table

Common Mistakes to Watch For

• Confusing a nearby noun with the actual subject (“The box of chocolates are on the table” — should be “is“).
• Forgetting the -s on regular present-tense verbs with he/she/it (“He walk to school” → “He walks“).
• Adding an unnecessary -s with plural subjects (“They walks” → “They walk“).
• Mismatching “was/were” in past tense (“You was late” → “You were late”).
• Treating collective nouns inconsistently within the same sentence.

Conclusion

Subject-verb agreement is a small grammar rule with a big impact on how polished your writing looks. Most mistakes come down to losing track of the real subject in a longer sentence, or slipping up on irregular verbs like “be,” “do,” and “have.” The good news is these errors are easy to catch once you know what to look for — and even easier with a quick check before you hit publish or send. Paste your text into the checker above to catch any agreement errors instantly.

Frequently Asked Questions

1. What is subject-verb agreement in simple terms?
It means the verb in a sentence must match its subject in number — singular subjects take singular verbs, and plural subjects take plural verbs.

2. What is the most common subject-verb agreement mistake?
Forgetting to add -s to the verb with third-person singular subjects (he, she, it), such as writing “she go” instead of “she goes.”

3. Does “you” take a singular or plural verb?
“You” always takes the plural verb form, even when referring to one person: “You are,” never “You is.”

4. How do I handle subject-verb agreement with collective nouns like “team” or “family”?
Treat them as singular when the group acts as one unit (“The team is winning”), and plural only when referring to individual members acting separately.

5. Can this checker catch every subject-verb agreement error?
It catches the most common patterns — pronoun subjects with be/do/have verbs and regular verb -s agreement — but very complex sentences with long noun phrases between subject and verb may need a manual review.